WO1999005219A1

WO1999005219A1 - Flame retardant with resistance to thermal deterioration, resin composition, and molded article

Info

Publication number: WO1999005219A1
Application number: PCT/JP1998/003253
Authority: WO
Inventors: Keiko Kazuki; Takeshi Imahashi; Akira Okada
Original assignee: Kyowa Chemical Industry Co., Ltd.
Priority date: 1997-07-22
Filing date: 1998-07-21
Publication date: 1999-02-04
Also published as: EP0952189B2; EP0952189A4; EP0952189B1; ATE286091T1; EP0952189A1; DE69828380T3; DE69828380D1; US6291570B1; DE69828380T2

Abstract

A flame retardant comprising hydrotalcite compound particles having excellent resistance to thermal deterioration when used as a flame retardant for resins; a synthetic resin composition containing the flame retardant; and a molded article obtained from the composition. The flame retardant is characterized by comprising hydrotalcite compound particles which have: (1) an average secondary-particle diameter as determined by the laser diffraction scattering method of 2 νm or smaller and (2) a total content of iron compounds and manganese compounds of up to 0.02 wt.% in terms of metal.

Description

Description Heat-deteriorating flame retardant, resin composition and molded product Technical field to which the invention pertains

The present invention relates to a heat-resistant and flame-retardant flame retardant composed of hydrotalcite compound particles having a specific property, and a synthetic resin composition having a heat-resistant and flame-retardant property obtained by blending the same in a fixed ratio. More specifically, there is almost no thermal deterioration during heat molding of synthetic resin, and it is made of hydrotalcite-based compound particles with specific properties that can impart excellent heat resistance and flame retardancy to the resin. The present invention relates to a fuel agent and a resin composition containing the same in a fixed ratio.

More specifically, the present invention relates to a resin composition and a molded product in which a relatively large amount of a heat-resistant and flame-retardant flame retardant is blended. The present invention relates to a resin composition and a molded article which are less reduced and hardly cause whitening of the molded article due to thermal deterioration of the molded article. The present invention also relates to a resin composition and a molded article having good dispersibility of particles, excellent non-agglomeration property, good moldability, and excellent physical properties such as impact strength.

Conventional technology

The demand for flame retardancy for synthetic resins is increasing year by year and is becoming more severe. In order to meet such demands for flame retardancy, flame retardants using organic halides and antimony trioxide in combination have been proposed and widely implemented. However, this flame retardant is partially decomposed during molding to generate halogen gas, which corrodes processing and molding machines, is toxic to workers, and has an adverse effect on the heat resistance or weather resistance of resins and rubber. And various problems such as the generation of a large amount of smoke containing harmful gas when the used molded article is burned.

For this reason, there has been an increasing demand for non-halogen flame retardants that do not have the above-mentioned problems. For example, aluminum hydroxide particles and magnesium hydroxide particles have been attracting attention. I got it.

However, aluminum hydroxide particles start dehydration at a temperature of about 190 ° C and cause foaming troubles in molded products.Therefore, it is necessary to keep the molding temperature below 190 ° C. There is a problem that the types of resins that can be formed are limited. On the other hand, magnesium hydroxide particles have an advantage that almost any resin can be applied since the dehydration start temperature is about 340 ° C. However, if a synthetic resin molded article filled with a high concentration of magnesium hydroxide flame retardant is exposed to carbonic acid-containing water, acid rain, etc. for a long time, magnesium hydroxide dissolved in acid on the product surface, for example, Precipitates in the form of magnesium carbonate, basic magnesium sulfate, etc., whitens the surface, impairs the appearance of molded products, and the magnesium hydroxide in the resin gradually migrates to the product surface, which is the inherent flame retardancy Is reduced.

On the other hand, hydridalcite compound particles have been developed as flame retardants because of their good acid resistance (Japanese Patent Laid-Open No. 52-910192).

However, the talcite compound particles have a property suitable as a flame-retardant molded product when blended with a resin.However, with the recent increase in required characteristics, there are still problems to be solved. It has been found.

In other words, to mix hydrotalcite-based compound particles with synthetic resin and pass the V-0 standard with a thickness of 1/8 inch to 1/16 inch in UL-94 flame retardant standard, It is necessary to add about 150 to 250 parts by weight of hydrotalcite compound particles to 100 parts by weight of the resin. The compounding of such a relatively large amount of hydrated talcite compound particles promotes deterioration of the molded article due to heating during molding and heating during use, and promotes the original physical properties of the molded article, especially the Izod impact strength and elongation. This causes a problem that the tensile strength and the like are reduced.

An object of the present invention is to solve the above-mentioned problems and provide a new and excellent heat-deteriorating flame-retardant flame retardant composed of talcite-type compound particles at the mouth and a heat-deteriorating flame-retardant resin composition containing the same. I do.

Means for Solving the Problems In order to achieve the above object, the present inventors have repeated studies on the purity and physical properties of the talcite-based compound particles at the mouth. As a result, it was found that the amount of the specific metal compound as an impurity in the hydrotalcite-based compound particles and the value of the average secondary particle diameter mutually affected the thermal deterioration of the resin. The inventors have found that a specific value can be used as a flame retardant having excellent heat deterioration resistance, and have reached the present invention.

Hydrate talcite compound particles contain various impurities mainly in the raw material during the manufacturing process, and the impurities are mixed into the hydrotalcite compound particles as a solid solution or impurities.

In other words, the talcite compound particles at the mouth are industrially produced mainly from magnesium, aluminum and alkali raw materials, and these raw materials mostly depend on natural resources or processed products thereof. Therefore, these raw materials contain many types of metal compounds and non-metallic compounds, and these materials are used after being refined to the extent permitted by the cost, but still contain many types of impurities. Mixing cannot be avoided.

In the manufacturing process, metal elution and contamination due to the materials of various devices such as reactors, storage vessels, transport piping, crystallizers and crushers occur to a considerable extent.

The present inventors have found that in many types of impurities contained in hydrated talcite compounds mixed from raw materials and from the manufacturing process, thermal degradation during resin molding processing, deterioration in physical properties, and the use of molded products Investigations into the components and their amounts that affect the thermal degradation of steels revealed that trace amounts of iron and manganese compounds in various impurities contained not only as contaminants but also as solid solutions. It has been found that even in such cases, the thermal degradation of the resin is affected.

In addition, in order for these specific impurities to exhibit a marked effect on thermal degradation, the content of the hydrotalcite-based compound particles must be kept below a certain level, and the particle size must also be affected. Therefore, the hydrated talcite compound particles to be blended with the resin to obtain a composition with extremely low thermal degradation include: (i) the amount of the specific metal compound is not more than a certain amount; and (ii) the average secondary particles. It was found that it was necessary to keep the diameter below a certain value (that is, most of the particles were not secondary aggregated). Thus, according to the study of the present inventors, high-purity hydrotalcite-based compound particles containing a certain amount or less of iron compounds and manganese compounds as impurities and having an average secondary particle diameter of 2 or less ( In other words, this means that most of the particles are primary particles that are not secondary agglomerated.) By this, it is found that a resin composition and a molded article with less deterioration in physical properties due to thermal deterioration can be obtained. did.

Means for solving the problem

According to the present invention, the object of the present invention is: (a) for a synthetic resin,

(b) (i) the average secondary particle diameter measured by laser diffraction diffraction method is 2 m or less,

(ii) the total content of the iron compound and the manganese compound is 0.02% by weight or less in terms of metal;

It is characterized in that the octaid talcite compound compound particles represented by the following formula (1) are blended in an amount of more than 10% by weight and not more than 80% by weight based on the total weight of (a) and (b). This is achieved by a flame-retardant synthetic resin composition having heat deterioration resistance.

χΑ1 _χ (0Η) ₂ Α ^η - _{x / n} 'm 0 (1)

However Shikichu, M represents Mg and Z or Zn, A ⁿ - represents a n-valent Anion, x, and m represents a positive number, each satisfying the following conditions.

0 <X <0.5, 0 ≤ m <1

Further, according to the present invention, another object is achieved by a heat-resistant and degradable flame retardant comprising the hydrated talcite compound.

Hereinafter, the present invention will be described in more detail.

The hydrotalcite-based compound particles in the present invention are chemically represented by the following general formula (1).

M, one _X A1 _X (0H) ₂ A "-s _{/ n} -mH, 0 (1)

However Shikichu, M represents Mg and / or Zn, A ⁿ - represents a n-valent Anion, x, and m represents a positive number, each satisfying the following conditions.

0 <X <0.5, 0 ≤ m <1

In the general formula (1), M represents Mg and / or Zn, but M represents Mg alone. Alternatively, it is preferably a mixture (solid solution) of Mg and Zn. When M is a mixture of Mg and Zn, it is preferable that Zn is equal to or less than Mg.

In the formula (1), x and m more preferably satisfy the following conditions.

0.1 <X <0.4 0 ≤ m <0.7

Furthermore, in formula (1), it is an anion of ⁿ 1 or n valence, which is usually an anion in a hydrated talcite compound. Specifically, C 0 ₃ ² —, N 0 _3- , HP 0 ₄ ² —, Preferred examples include OH— and oxygen acid anions of S, Si and B, and particularly preferred is CO / —.

The hydrotalcite compound particles have an average secondary particle diameter of 2 // m or less as measured by a laser diffraction scattering method, that is, most particles are primary particles without secondary aggregation. These particles are necessary for achieving the object, and preferably have an average secondary particle diameter of 0.4 to 1.0 m.

Further, the hydrotalcite-based compound particles have a specific surface area of 1 to 3 Om ² Zg, preferably 3 to ² Om ² / g, as determined by the BET method. In addition, it is preferable that the hide mouth compound compound particles have a ratio of the specific surface area by the BET method / the specific surface area by the Blaine method of 1 to 6, preferably 1 to 3, because the dispersibility in the resin is good.

Further, the talcite-type compound particles of the present invention have a total content of iron compound and manganese compound of 0.02% by weight or less, preferably 0.01% by weight or less as impurities (Fe + Mn). Things.

As described above, the hydrotalcite-based compound particles of the present invention have, as impurities, a total amount of metal conversion (Fe + Mn) within the above range. More preferably, a cobalt compound, a chromium compound, a copper compound, It is desirable that the content of the heavy metal compound as a metal, including the contents of the vanadium compound and the nickel compound, be within the above range. That is, the hydrated talcite compound particles have a total content of (Fe + Mn + Co + Cr + CU + V + Ni) of 0.02% by weight or less, preferably 0.01% by weight or less as a metal. Is advantageous for the layer.

Content of iron and manganese compounds in hydroidalcite compound particles The higher the amount, the more significantly the thermal stability of the compounded resin is reduced. However, the fact that the total amount of the iron compound and the manganese compound only satisfies the above range does not mean that the heat resistance of the resin is excellent and that the deterioration of the physical properties of the resin is not impaired. It is necessary that the diameter satisfies the above range. As the average secondary particle diameter of the particles increases, the contact surface with the resin decreases and the thermal stability improves, but problems such as a decrease in mechanical strength and poor appearance arise.

Further, when the specific surface area of the hydrotalcite-based compound particles measured by the BET method exceeds 30 m ² / g, the dispersibility in the resin is lowered and the thermal stability is also lowered.

As described above, the hydrated talcite compound particles have (i) a chemical structural formula represented by the general formula (1), (Π) an average secondary particle diameter, (iii) a specific surface area, and (iv) Total content of compound and manganese compound (or total amount of other metal compounds) Power Within the above range, compatibility with resin, dispersibility, non-agglomeration, molding and calorie properties, appearance of molded product, A resin composition that satisfies various properties such as mechanical strength, heat deterioration resistance and flame retardancy can be obtained.

The method for producing the hydrated talcite compound compound particles of the present invention is not particularly limited as long as hydrotalcite compound particles satisfying the requirements (i) to (iv) are obtained. Raw materials and production conditions for obtaining hydrotalcite compound particles are known per se, and can be produced basically according to a known method (for example, Japanese Patent Publication No. 46-22880 and The corresponding US Pat. No. 3,650,704; Japanese Patent Publication No. 47-321198 and the corresponding US Pat. No. 3,795,255; 0-3003 S Publication;

8-2 947 7 and Japanese Patent Publication No. 51-291 279).

On the other hand, the raw materials used to produce hydrotalcite-type compound particles in large quantities on an industrial scale include aluminum sulfate and aluminum hydroxide as an aluminum source, magnesium chloride (brine and ion bitter) as a magnesium source, A typical source of alkali is lime (or its digest), which are mostly natural resources or processed products.

The industrial raw materials for these hydrotalcite-type compound particles are mostly As described above, hydrotalcite-based compound particles obtained by using these raw materials contain not less than a small amount of impure metal compounds such as iron compounds and manganese compounds, and these impure metal compounds can be used as solid solutions or impurities. And cannot be removed by simple means.

Even when raw materials having a low content of impure metal compounds (which are generally expensive) are used, if a large amount of hydrotalcite-based compound particles are produced on an industrial scale, a reaction apparatus, a storage tank, Mixing of material components from equipment such as transport piping, crystallizers, crushers and dryers is inevitable. The manufacturing process of hydrotalcite compound particles includes a reaction under alkaline conditions and a long-term heating and aging process. Unless special consideration is given to the material of the equipment, impure metals such as iron compounds are used. Compound contamination occurs.

Therefore, special considerations are required to obtain hydrotalcite-based compound particles having extremely low contents of iron compounds and manganese compounds according to the present invention. That is, (i) as a raw material, an impurity metal compound such as an iron compound and a manganese compound is previously removed or a material having a low content is selected and used; In the manufacturing process, it is necessary to use equipment made of materials that minimize elution and contamination of the impurity metal compounds from various equipment. US Pat. No. 3,650,704 discloses hydrotalcite-based compound particles having a heavy metal impurity content of 30 ppm or less. These special hydrotalcite particles are synthetic hydrotalcite compound particles for use as gastric antacids in the stomach-highly purified and antacid effects for human body use. It is expensive. The patent states that the introduction of impurities harmful to the human body can be avoided by careful selection of the quality (class) of the raw material (Column 2, lines 12-26). However, there is no specific and detailed explanation of the quality of the raw materials. The above-mentioned features merely stipulate the content of heavy metal impurities in hydrotalcite-based compound particles as pharmaceuticals, and the hydrated talcite-based compound particles use special raw materials and have a special small size. Equipment (eg glass container and glass lining equipment) It was obtained.

The hydrotalcite-based compound particles of the present invention can be obtained by removing impure metal compounds such as iron compounds and manganese compounds in the raw materials or by selecting and using a raw material having a low content of these impure metal compounds. Can be In the production, equipment should be selected from materials that are resistant to alkali and acid, with very little elution or contamination of iron compounds and manganese compounds, especially iron compounds.

The hydrotalcite-based compound particles of the present invention are industrially used resin additives and are required to be inexpensive. Therefore, it is not advisable to use excessively refined aluminum raw materials, magnesium raw materials, and alkaline raw materials because they increase costs.

Thus, the hydrous lucite compound particles of the present invention are particles that do not mainly contain iron compounds and manganese compounds and have a certain average particle size and specific surface area, thereby achieving a demand for high quality resin, that is, a high heat resistance. A resin composition that satisfies the requirements for deterioration and flame retardancy was provided.

Specifically, the hydrated talcite-type compound particles of the present invention can be used, for example, as a raw material of magnesium, a product obtained by subjecting seawater, natural brine or yeon bitter to purification means for removing iron compounds and manganese compounds, and an aluminum raw material. As such, industrial aluminum sulfate or aluminum chloride can be used.

Further, as an alkaline raw material, industrial caustic soda is suitable, and natural lime is difficult to purify and is not preferred. Further, as a raw material for carbonate ions, industrial sodium carbonate or carbon dioxide can be used. Hereinafter, the composition in various raw materials, particularly the contents of the iron compound and the manganese compound will be specifically described in Examples described later. In addition, the materials of various devices will be specifically described.

The hydrotalcite compound particles used in the present invention can be blended with the synthetic resin itself, but the particles can be used after being treated with a surface treating agent, which is usually preferred.

Examples of such surface treatment agents include higher fatty acids, anionic surfactants, phosphates, coupling agents, (silane-based, titanate-based, and aluminum-based). And at least one selected from the group consisting of esters of polyhydric alcohols and fatty acids.

Examples of the surface treatment agent preferably used are as follows. Higher fatty acids having 10 or more carbon atoms, such as stearic acid, erlic acid, palmitic acid, lauric acid, and behenic acid; metal salts of higher fatty acids: higher alcohols such as stearyl alcohol and oleyl alcohol Sulfate of polyethylene glycol ether; Sulfate of polyethylene glycol ether, Sulfate of amide bond, Sulfate of ester bond, Ester bond sulfonate, Sulfonate of amide bond, Sulfonate of ether bond, Alkyl aryl sulfonate of ether bond Surfactants such as ester-bonded alkylarylsulfonate and amide-bonded alkylarylsulfonate; mono- or diesters such as orthophosphoric acid and oleyl alcohol, stearyl alcohol or a mixture of both. And their acid form or Are phosphoric esters such as alkali metal salts or amine salts; vinyl ethoxysilane, vinyl tris (2-methoxy-ethoxy) silane, gamma-methacrylonitrile criproxy vir trimethoxy silane, gamma-amino propyl trimethoxy silane, Evening— (3,4-epoxycyclohexyl) silane coupling agents such as ethyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, and gamma-mercaptopropyltrimethoxysilane; isopropyl triisostearoyl titanate Titanate-based coupling agents such as isopropyl tris (dioctyl pyrophosphate) titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate, and isopropyl pyrtridecylbenzenesulfonyl titanate Aluminum-based power coupling agent such as § Seto aluminum diisopropylate; glycerol monostearate, esters of polyhydric alcohols and fatty acids such as glycerin mono-O-oleate.

The surface coating treatment of the talcite compound particles using the above-mentioned surface treatment agent can be carried out by a known wet or dry method. For example, as a wet method, the surface treating agent is added in a liquid or emulsion state to a slurry of hydrotalcite compound particles, and mechanically at a temperature of up to about 10 ° C. Just mix for a minute. In the dry method, the surface treatment agent is added in a liquid, emulsion, or solid form with sufficient stirring to the talcite compound particles with a mixer such as a Henschel mixer, and mixed well with or without heating. do it. The amount of the surface treatment agent can be appropriately selected, but is preferably about 10% by weight or less based on the weight of the hydrated talcite compound particles.

The hydrotalcite-type compound particles having been subjected to the surface treatment can be subjected to a method such as washing with water, dehydration, granulation, drying, pulverization, classification and the like, as appropriate, to obtain a final product form. The hydrated talcite compound particles according to the present invention may contain more than 10% by weight and not more than 80% by weight, preferably 15% by weight, based on the total weight of (a) the synthetic resin and (b) the hydroidalcites compound particles. It is blended with resin at a ratio of 75% by weight. The synthetic resin into which the octaid talcite compound particles of the present invention are blended may be any resin that is usually used as a molded article, and is usually a thermoplastic synthetic resin, and examples thereof include polyethylene and polypropylene. Polymers or copolymers of ₂ to ₈ olefins (polyolefins) such as ethylene Z propylene copolymer, polybutene, poly 4-methylpentene-1, etc., copolymers of these olefins and gens, Ethylene monoacrylate copolymer, polystyrene, ABS resin, AAS resin, AS resin, MBS resin, ethylene Z-vinyl chloride copolymer resin, ethylene vinegar bicobolimer resin, ethylene monovinyl chloride-vinegar bigraft polymer resin, vinylidene chloride, polystyrene Vinyl chloride, chlorinated polyethylene, chlorinated polypropylene, PVC copolymer, vinyl acetate resin, Examples thereof include thermoplastic resins such as phenoxy resins, polyacetals, polyamides, polyimides, and polyacryl-carbonates, polysulfones, polyphenylene oxides, polyphenylenesulfuric resins, and thermoplastic elastomers.

Preferred examples of these thermoplastic resins are polyolefins or copolymers thereof, which are excellent in the effect of preventing thermal degradation by the hydrotalcite compound particles and have excellent mechanical strength retention properties. , Polypropylene resin such as ethylene propylene copolymer, high density polyethylene, low density polyethylene, linear low density polyethylene, ultra low density polyethylene, EVA ( Polyethylene resins such as Tylene vinyl acetate resin), EEA (Ethylene ethyl acrylate resin), EMA (Ethylene methyl acrylate copolymer resin), EAA (Ethylene acrylate copolymer resin), Ultra high molecular weight polyethylene , and polybutylene polymethylpentene, poly 4-methyl pentene - a polymer or a copolymer of one C ₂ -C ₆ such as Orefin (alpha-ethylene).

Further, thermosetting resins such as epoxy resins, phenolic resins, melamine resins, unsaturated polyester resins, alkyd resins, and urea resins, and synthetic rubbers such as EPDM, butyl rubber, isoprene rubber, SBR, NBR, and chlorosulfonated polyethylene are exemplified. can do.

The synthetic resin used in the present invention is not limited at all by the production method. For example, in the case of polyolefin, any polymerization catalyst may be used, such as the Ziegler method, the Chidara * nuts method, the Friedel-Crafts method, the meta-mouth method, the Phillips method, and the like.

The resin composition of the present invention is substantially formed from (a) the synthetic resin and (b) the octasite talcite compound particles, and further comprises a small proportion of a flame retardant aid (C). Can be. The incorporation of this flame retardant aid (c) can reduce the proportion of (b) the particles of the hydrite compound compound at the mouth and can increase the flame retardant effect.

The flame retardant aid (c) is preferably red phosphorus powder, carbon powder, or a mixture thereof. As the red phosphorus, besides ordinary red phosphorus itself for a flame retardant, for example, red phosphorus whose surface is coated with a thermosetting resin, polyolefin, carboxylic acid polymer, titanium oxide or titanium aluminum condensate can be used. Examples of the carbon powder include carbon black, activated carbon, and graphite. The carbon black is prepared by any of an oil furnace method, a gas furnace method, a channel method, a thermal method, and an acetylene method. May be used. When the flame retardant aid (c) is blended, the proportion thereof is 0.5 to 20% by weight, preferably 0.5 to 20% by weight, based on the total weight of (a) the thermoplastic resin and (b) the hydrotalcite compound particles. A range of 1 to 15% by weight is suitable. In the present invention, a polymer alloy compatibilizer may be incorporated in order to improve the strength of the resin composition. Examples of the polymer alloy compatibilizer include a maleic anhydride-modified styrene-ethylene-butylene resin, a maleic anhydride-modified styrene-ethylene-butylene resin, a maleic anhydride-modified polyethylene, a maleic anhydride-modified EPR, a maleic anhydride-modified polypropylene, Lupoxyl-modified polyethylene, epoxy-modified polystyrene / PMMA, polystyrene-polyimide block copolymer, polystyrene-polymethyl methacrylate block copolymer, polystyrene-polyethylene block copolymer, polystyrene-ethyl acrylate graft copolymer, polystyrene-polybutadiene graft Copolymer, polypropylene-ethylene-propylene-diene graft copolymer, polypropylene-polyamide graft copolymer, polya Acrylic acid Echiru - Helsingborg amide graft copolymer Chief are exemplified.

The resin composition having heat resistance and flame retardancy of the present invention may contain other conventional additives in addition to the above components. Such additives include, for example, antioxidants, antistatic agents, pigments, foaming agents, plasticizers, fillers, reinforcing agents, crosslinkers, light stabilizers, nucleating agents, ultraviolet absorbers, lubricants, and others. Examples thereof include inorganic or organic flame retardants.

In order to prepare the composition of the present invention, there is no particular limitation on the means of combining the hydrotalcite compound particles with the resin itself. For example, a known and customary compounding method in which a stabilizer, a filler, and the like are added to the resin. By the same means as the means, it may be mixed with the other resin compounding agents or separately as uniformly as possible in the synthetic resin. For example, a means of compounding using known mixing means such as a lip blender, a high-speed mixer, a mixer, a pelletizer, an extruder, and a flame retardant containing hydroidtalcite compound particles as an active ingredient. Means for adding the suspension to the slurry after the polymerization, stirring and mixing, and drying the suspension can be exemplified. Example

Hereinafter, the present invention will be described in more detail based on examples. All% means weight% I do. However, the mixing ratio of the antioxidant is the ratio (%) to the total weight of (a) synthetic resin, (b) hydrated talcite compound particles and (c) flame retardant auxiliary. In the examples, (a) the average secondary particle diameter and (b) the BET specific surface area of the hydrated talcite compound particles mean the values measured by the measurement methods described below.

(1) Average secondary particle diameter of hydrotalcite compound particles

Determine and measure using MICROTRAC particle size analyzer SPA type [LEEDS & NORTHRUP INSTRUMENTS].

Add 7 O Omg of sample powder to 70 ml of water, disperse by ultrasonic wave (Model US-300, manufactured by NISSEI, current 300 / XA) for 3 minutes, and take 2-4 ml of the dispersion. Then, 250 ml of degassed water is added to the sample chamber of the particle size analyzer, and the analyzer is operated to circulate the suspension for 8 minutes, and then the particle size distribution is measured. Perform the measurement twice in total, calculate the arithmetic mean of the 50% cumulative secondary particle size obtained for each measurement, and use it as the average secondary particle size of the sample.

(2) BET specific surface area of hydrated talcite compound particles

It was measured by a liquid nitrogen adsorption method.

(3) Izod impact strength

It was measured according to JIS K7110.

(4) Tensile strength

It was measured according to JIS K7113.

(5) Flame retardant ―

The test piece was immersed in ion-exchanged water at 40 ° C for 10 days, taken out into the air, and measured according to the UL 94 £ method and the 94HB method.

(6) Metal analysis

It was measured by the ICP-MS method (Inductively Coupled Plasma-Mass Spectrometry).

I. Preparation of various hydrotalcite compound particles and their properties:

I-(1) Chemical structure formula of particles of octaphthalide compound; The chemical structural formulas and sample numbers of the various hydrotalcite compound particles prepared in Examples 1 to 2 and Comparative Examples 1 to 5 are shown below.

Sample name Structural formula

_{_{_{AI Mg o. 7 Al o.}}} 3 (OH) 2 (CO 3) 0. 15 · 0.5H 2 0

A -.... II Mg 0 5 Zn o 2 Al o 3 (OH) 2 (CO 3) 0 l5 -0.55H 2 O

_{_{_{BI Mg 0. 7 Al 0 .3}}} (OH) 2 (C0 3) o. L5 -0.5H 2 0

B-II Mg. ₇ Al. _{_{. 3 (OH) 2 (C0}} 3). ₁₅ '0.55H ₂ 0

BI 11 Mg _M Zn. ₃ Al ₃ (OH) ₂ (CO ₃ ). ₁₅ .0.55H ₂ 0

_{_{B -.. IV Mg o 7}} Al 03 (OH) 2 (CO 3) o 15 -0.55H 2 0

BV Mg ₀₇ Al _o . ₃ (OH) ₂ (CO ₃ ) o. ₁₅ -0.55H ₂₀

I-(2) Types and properties of various raw materials;

In the following Examples 1-2 and Comparative Examples 1-5, properties of various raw materials used for preparing hydrotalcite-based compound particles are shown below.

Raw material No.11 Aluminum hydroxide

A1 (0H) ₃ % 99.7

Fe% 0.0035

Mn% 0.0001

Example 1 (Preparation of hydrotalcite-based compound particles A-1) Purified brine (raw material No. 2) was transferred to a concentration adjusting tank, and aluminum sulfate (raw material No. 4) was added thereto to add a Mg concentration of 1.95mo1 / L. A mixed aqueous solution (A) having an A 1 concentration of 0.847 mo 1 / L was prepared. Next, the caustic soda (raw material No. 6) was transferred to another tank for concentration adjustment, and sodium carbonate powder (raw material No. 7) and water (raw material N).

0.9) was made of an aqueous solution (B) containing NaOH 3mo 1 / L and N a ₂ C_〇 ₃ 0. 23 mo 1 / L added.

Aqueous mixed solution (A): 1.18 L to aqueous solution (B) 2.2 L, simultaneously poured into a reaction vessel pre-filled with water so that the residence time is 60 minutes with stirring. As a result, a reaction slurry of hydrous site (Η. Τ.) Was obtained. 800 L of the reaction slurry was collected and maintained in an autoclave with stirring at 170 ° C for 20 hours for heat aging. After cooling, transfer the slurry to a surface treatment tank, heat it to 80 ° C with stirring, gradually add 2 kg of sodium stearate (raw material No. 10) dissolved in 50 L of hot water at 80 ° C and stir for 30 minutes Was maintained to complete the surface treatment. The solid was separated by filtration, washed, dried with a hot air drier, and then pulverized with a hammer mill to obtain a sample.

As a result of analyzing the obtained H.T., the composition formula was

Mg ₀₇ Al ₀₃ (OH) ₂ (C〇 ₃ ) _{0 I5} · 0.5H, 0.

The equipment used here was composed of the following materials.

1. Material tank (for brine): FRP lining SUS 304

2. Material tank (aluminum sulfate): FRP lining SUS 304

3. Concentration adjustment tank (brine + aluminum sulfate): FRP lining SU S

304

4. Raw material tank (for caustic soda): SUS 304

5. Tank for concentration adjustment (caustic soda + sodium carbonate): SUS 304

6. Transport tube (for brine and mixture): PVC tube

7. Transport tube (caustic soda and mixture): SUS 304

8. Transport pipe (for hydrothermal treatment): SUS 316 L 9. Reaction vessel and autoclave: Hastelloy C276 lining SUS 304

10. Stirrer: S U S 316 L

1 1. Fil Yuichi, dryer and crusher: SUS 304 natural underground brine purification method

As the purified brine (raw material No. 2), natural brine (raw material No. 1) purified by the following method was used.

Iron and manganese in brine collected from the ground exist as divalent ions, trivalent ions, and colloidal iron. In order to remove these iron and manganese, they were oxidized with chlorine after oxidizing with air. The obtained oxide was coagulated and filtered to obtain purified brine (raw material No. 2). Example 2 (Preparation of hydrotalcite compound particles A-Π)

In Example 1, the same reaction was carried out using exactly the same apparatus except that in the raw materials, ion bitter and salted zinc were used instead of purified brine. That is, ion bitter (raw material No. 3) is transferred to a concentration adjustment tank, and zinc chloride (raw material No. 5) and aluminum sulfate (raw material No. 4) are added, and the Mg concentration is adjusted to 1.05mo 1 and the Zn concentration

Make a mixed aqueous solution of 0.42mo 1 ZL and 0.61mo 1 ZL. At this time, calcium sulfate precipitates in the mixing tank, so it is filtered and used as solution (A). Next, the caustic soda (raw material No. 6) is transferred to another concentration adjusting tank, and sodium carbonate powder (raw material No. 7) and water (raw material No. 9) are added, and Na〇H 3mo 1 / L is added. , N a ₂ C_〇 ₃ make 0. 225mo 1 ZL solution (B).

(A) 1 liter of solution and (B) 1.4 liters of solution were simultaneously poured into a reaction tank previously filled with water so that the residence time would be 60 minutes with stirring, and the reaction of HT A slurry was obtained.

800 L of the reaction slurry was collected and maintained in an autoclave with stirring at 140 ° C. for 10 hours for heat aging. After cooling, transfer the slurry to the surface treatment tank. Then, warm to 80 ° C with stirring, gradually add 1.3 kg of sodium stearate (raw material No. 10) previously dissolved in 50 L of warm water at 80 ° C, and stir for 30 minutes. To complete the surface treatment. The solid was separated by filtration, washed, re-emulsified, and spray-dried to obtain a sample.

As a result of analyzing the obtained H.T., the composition formula was

Mg _0. ₅ was _{_{Z n 02 A 1 0 .3 (}} OH) 2 (C0 3) ι5 · 0.55Η 2 0. Comparative Example 1 (Preparation of hydrotalcite-based compound particles II)

In Example 1, except that unpurified brine (raw material Νο. 1) was used instead of purified brine, the same raw material was used, the same concentration was used, and the reaction slurry of Η. Τ. I got

After 800 L of the above-mentioned slurry was collected and heat-aged similarly, surface treatment was similarly performed with soda stearate, and the same operation as in Example 1 was performed to obtain a sample.

As a result of analyzing Η. Τ. At this time, the composition formula is

Mg. ₇ Al. ₃ (OH) ₂ (C〇 ₃ ). ₁₅ · 0.5H ₂₀ . Comparative Example 2 (Preparation of hydrated talcite compound particles B-Π)

In Example 1, the reaction vessel, autoclave, and surface treatment tank used were carbon steel sheets for medium and normal pressure vessels (SGP material, JIS G31 18-1977). A product was obtained in the same manner except that a carbon steel pipe for use (SGP material, JIS G34 52-1984) was used. _

As a result of analyzing the obtained H.T., the composition formula was

_{_{_{Mg 07 Al 03 (OH) 2}}} (C0 3) was 0.15 · 0.55H ₂ 0. Comparative Example 3 (Preparation of Hyd-mouth talcite compound particles B-m)

Slaked lime (raw material No. 8) obtained from natural stone was transferred to a concentration adjusting tank to obtain 200 g / L slurry as C a (〇H) ₂ . On the other hand, refined brine (raw material No. 2) was transferred to a concentration adjusting tank, and water (raw material No. 9) was added to produce 2 mo 1 as Mg. After the aqueous solution was obtained, it was transferred to a reaction vessel, and gradually added with stirring at a ratio of 0.726 L of a Ca (OH) ₂ aqueous solution to 1 L of an aqueous Mg solution. The obtained magnesium hydroxide slurry was dehydrated with a filter, washed with water, added with water, and re-emulsified to obtain a slurry of 50 g / L as magnesium hydroxide. After 35.1 L of zinc chloride (raw material No. 5) and 70.9 L of aluminum sulfate (raw material No. 4) were added to 229.4 L of the above magnesium hydroxide slurry with stirring, 7.83 kg of sodium carbonate was dissolved. 327.9 L of caustic soda of 1 ZL was gradually charged to obtain a mixed slurry. Water was added to the slurry to make it 800 L, and the mixture was heated and aged in an autoclave at 150 ° C for 6 hours while stirring to obtain an HT slurry. After cooling, the slurry was transferred to a surface treatment tank, heated to 80 ° C with stirring, and 0.75 kg of sodium stearate (raw material No. 10) previously dissolved in 50 L of hot water at 80 ° C was gradually added. The surface treatment was completed by maintaining stirring for minutes. The solid was separated by filtration, washed, dried with hot air, and then pulverized to obtain a sample.

The reaction vessel, autoclave and surface treatment tank were made of medium and normal pressure carbon steel sheet (SGP material, JISG 3118-1977). SGP material, JIS G3452-198 4) was used.

As a result of analyzing the obtained H.T., the composition formula was

_{_{_{Mg 04 Z n 0. 3 A}}} 1 (OH) 2 (CO s) 0. Ι5 · 0.55Η was ₂ 0. Comparative Example 4 (Preparation of hydrotalcite-based compound particles IV)

Slaked lime (raw material No. 8) obtained from natural stone was transferred to a concentration adjusting tank to obtain 200 gZL slurry as C a (〇H) ₂ . On the other hand, purified brine (raw material No. 2) was transferred to a concentration adjusting tank, and water (raw material No. 9) was added to obtain a 2 mol / L aqueous solution as Mg. Next, the mixture was transferred to a reaction vessel, and gradually added with stirring at a ratio of 0.726 L of an aqueous solution of Ca (OH) ₂ to 1 L of an aqueous solution of Mg. The obtained magnesium hydroxide slurry was dehydrated with a filter, washed with water, added with water, and re-emulsified to obtain a slurry of 100 gZL as magnesium hydroxide. The above magnesium hydroxide slurry 29 5.7 While stirring to 7 L, 17.01 Kg of aluminum hydroxide (Raw material No. 11) and 11.54 Kg of sodium carbonate dissolved in water (Raw material No. 7) and water (Raw material No. 9) were added to make 800. .

This mixed slurry was heated and aged for 180 hours at 180 ° C. for 20 hours while stirring in an autoclave to obtain an HT slurry. After cooling, the slurry was transferred to a surface treatment tank, and agitation treatment was performed using 1.7 kg of sodium stearate as in Example 1. All the devices used were the same as in Example 1.

As a result of analyzing the obtained H.T., the composition formula was

_{_{Mg 07 A 1 (OH) 2}} (C0 3) o, 5 -. 0.55H was ₂ 0. Comparative Example 5 (Preparation of hydrotalcite compound particles B-V)

Transfer the purified brine (raw material No. 2) to the concentration adjustment tank and add aluminum sulfate (raw material No. 4) to obtain a mixed aqueous solution (A) with a Mg concentration of 1.95mo 1 ZL and an A1 concentration of 0.847mo 1 / L. Had made. Then caustic soda (raw material No. 6) was transferred to another concentration control tank, N aOH 3mo 1 / L and N a ₂ C_〇 ₃ 0 added carbonate source Ichida powder (raw material No. 7) and water. An aqueous solution (B) containing 23 mo1 / L was prepared.

Aqueous mixed solution (A) 1.18 L to aqueous solution (B) 2.2 L at the same time, into a reaction vessel previously filled with water, while stirring, so that the residence time is 60 minutes. A reaction slurry was obtained. 800 L of this reaction slurry was transferred to a surface treatment tank, heated to 80 ° C with stirring, and 2 g of sodium stearate (raw material No. 10) previously dissolved in 50 L of hot water at 80 ° C was added. The surface treatment was completed by gradually charging and maintaining the stirring for 30 minutes. The solid was separated by filtration, washed, dried with hot air, and ground to obtain a sample.

As a result of analyzing the obtained H.T., the composition formula was

_{_{_{Mg 0. 7 A 1 0.}}} 3 (OH) 2 (C0 3) was ₀₁₅ · 0.55H ₂ 0.

Note that the same devices as in Example 1 were used for all the devices used here. Each of the hydrotals obtained by Examples 1 to 2 and Comparative Examples 1 to 5 above. The properties and metal contents of the site compound particles are summarized in Table 1 below.

table 1

調製 Preparation of resin composition and evaluation of physical properties Examples 3 to 4 and Comparative Examples 6 to 10

(Evaluation of thermal stability and physical properties of resin composition)

Examples 1-2 and Comparative Examples:! Using various hydrotalcite compound compound particles shown in Table 1 of Tables 1 to 5, test pieces were prepared with the following composition.

50% hydrotalcite compound particles (However, the surface treatment is performed with 3% by weight of stearic acid based on the hydrotalcite compound particles)

50% polypropylene (MF I 2 g / 10 min impact grade)

0.1% antioxidant (Cilibaox 1010)

0.1% antioxidant (DLTP manufactured by Yoshitomi Pharmaceutical)

0.3% Bis (P-ethylbenzylidene) solbitoi (nucleating agent)

(i) Test piece preparation method

The hydrotalcite-based compound particles of each surface-treated sample are dried at 105 ° CX for 16 hrs and then at 150 ° C for 4 hours to remove adhering moisture. The resulting mixture was kneaded at 185 ° C with a twin screw extruder, dried again at 120 ° C for 4 hours, and molded at 185 ° C with an injection molding machine.

Twin screw extruder: Plastic Engineering Laboratory

BT- 30-S 2-30-L

Injection molding machine: manufactured by Nissei Plastic Industry Co., Ltd.

F S 120 S 18 A SE

(ii) Measurement of thermal stability

Equipment: Gear oven GPHH-100 manufactured by Bayesspec

Setting conditions: 150 ° C, damper opening 50%

A set of two test pieces is sandwiched between papers, fastened with metal clips, suspended on a rotating ring, and withdrawn over time. Test piece: 12.7X 12.7X2.1 mm

Judgment: The time until whitening was recognized on the test piece was used as a measure of thermal deterioration. The time required for the test piece to lose 10% weight at 150 ° C was also examined. Izod impact test pieces and tensile test pieces heated at 150 ° C for 7 days were conditioned for 4 days at 23 ° C ± 2 ° C and 50% ± 5% RH, and Izod impact strength and tensile strength were also measured.

(iii) Evaluation results

The evaluation is shown in Table 2 below.

Table 2 Example 3 Example 4 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Hydrotalcites

A— I — I B-II B— III

Compound particle name A-11 B B-IV Β— V Days to whitening 20 16 3 2 1 1.5 5 Izod impact strength 7

丄. Upper 3 q 1

丄 4. o

丄o.丄丄. ^丄ό. Ϋ丄. "Ο3 ₍

(Kg f cm / cm with notch)

Tensile strength (kgf / band ² ) 2.38 2.45 2.08 2.03 1.93 2.01 1.42 Flame retardant

Pass Pass Pass Pass Pass Pass Pass Pass (UL 94HB1 / 8 inch)

10% weight loss (time)

520 420 120 100 50 60 160 Izod impact strength

150 at X 7 days 14.5 15.8 1 or less 1 or less 1 or less 1 or less 1 or less (notched kgf cm / cm)

Tensile strength

150 ° CX 7 days 2.33 2.40 0.5 or less 0.5 or less 0.5 or less 0.5 or less 0.5 or less (kg f cm / cm)

Example 5 and Comparative Example 11

A resin composition having the following composition was prepared.

90 parts by weight Ethylene 'vinyl acetate copolymer (containing 41% vinyl acetate) 10 parts by weight Polymer alloy compatibilizer (ToughTech M—1943 manufactured by Asahi Kasei Kogyo)

150 parts by weight hydrotalcite compound particles (A-I or B-I; surface treatment is performed with 0.25 parts by weight of sodium oleate per 100 parts by weight of hydrotalcite compound particles)

2 parts by weight DCP (dicumyl peroxide)

1 part by weight Silane coupling agent (NUC A-172)

1 part by weight Antioxidant (Cilvaox 1010 manufactured by Ciba-Geigy Co., Ltd.) Test piece preparation method

Kneading at 120 with a kneading extruder.

After preforming at 120 ° C for 5 minutes using a compression molding machine, cross-linking was performed at 180 ° C for 15 minutes to obtain 2 mm and 6.36 mm plates.

Measurement of thermal stability

Heat resistance: A test piece having a width of 25 mm and a length of 50 mm was obtained from a cross-linked plate having a thickness of 2 mm, and a heat resistance test was performed in the same manner as in Example 1.

Tensile strength: A test piece of a No. 2 test piece of JIS 7113 was obtained, and measured at a test speed of 200 mm / min.

Evaluation results -

The measurement results are shown in Table 3 below.

Table 3 Example 1 5 Comparative Example 1 11 Name of hydrotalcite compound particles A—I B-I Days until whitening 23 5

Tensile strength (kg i / m ² ) 1.63 1.45 Flame retardant (UL 94VE1 / 4 inch) V— 0 V— 0 Example 6 and Comparative Example 12

A resin composition having the following composition was prepared.

70% hydrotalcite compound particles (A-II or B-III; however, surface treated with 2% by weight of isopropyl triisostearoyl titanate based on hydrotalcite compound particles)

30% polypropylene (MF I 2 gZl 0 min impact grade)

0.1% antioxidant (Cilibaox 1010)

0.1% Antioxidant (DLTP made by Yoshitomi Pharmaceutical)

0.3% Bis (P_ethylbenzylidene) solbitol (nucleating agent)

A test piece was prepared from the resin composition in the same manner as in Example 3, and the thermal stability and flame retardancy were evaluated. The results are shown in Table 4 below. Table 4

Example 7 and Comparative Example 13

A resin composition having the following composition was prepared.

30% hydrotalcite-type compound particles (A-II or B-III; provided that the surface is treated with 0.5% by weight of gamma-aminoprovir trimethoxysilane with respect to hydrotalcite-type compound particles) )

7% red phosphorus (Rin Kagaku Kogyo; Nova Excel 140) 3% force black (oil furnace method FEF)

50% polypropylene (MF I 2 g / 10 min impact grade)

5% polymer alloy compatibilizer (TAFTEC M-1943, manufactured by Asahi Kasei Corporation)

5% thermoplastic elastomer (Mitsui Chemicals Mirastomer 703 ON)

0.1% antioxidant (Cilva Geigy Filganox 100)

0.1% antioxidant (DLTP manufactured by Yoshitomi Pharmaceutical)

0.3% Bis (P-ethylbenzylidene) solbitol (nucleating agent)

A test piece was prepared from the resin composition in the same manner as in Example 3, and the thermal stability and flame retardancy were evaluated. The results are shown in Table 5 below.

Table 5

Example 8

The following resin compositions (1) to (3) were prepared, test pieces were prepared in the same manner as in Example 3, and the flame retardancy of each was evaluated. However, in the case of nylon 6, kneading and injection molding were performed at 250 ° C. As a result, (1) and (2) were UL94—VE 1Z16 inches with a flame retardancy of V-0, and (3) was 1/4 inch thick and passed UL94-1 HB.

(1)

68% Hachidoku Talcite-like compound particles (A-I)

3 2% nylon 6 (injection molding grade with specific gravity of 1.14) 0.2% antioxidant (Cilgaox 1098)

(2)

70% Hyd-mouth talcite-like compound particles (A-I)

30% high-density polyethylene (MF I 5.0 g / 10 min injection molding grade) 0.1% antioxidant (Cilibaox 1010)

0.1% Antioxidant (DLTP made by Yoshitomi Pharmaceutical)

(3)

10% hydrotalcite compound particles (A-I)

10% red phosphorus (Rin Kagaku Kogyo; 1-Baexel 140)

5% carbon black (oil furnace method FEF)

70% ABS resin (MF I 25 g / 10 minutes impact resistant grade)

5% nylon 6 (injection molding grade with specific gravity of 1.14)

0.2% antioxidant (Cilibaox 1010)

The following composition was prepared, masticated with an open roll at 70 ° C., and one day later, vulcanized at 160 ° C. for 30 minutes to obtain a 1Z 8-inch thick plate. From the obtained plate, a test piece having a thickness of 1/8 inch for a UL94-VE test was prepared. This test piece was tested for UL 94VE. As a result of the test, the flame retardancy was V-1.

Composition

100 parts by weight EPDM rubber (Ethylene Z propylene ratio = 50 50 mol) 170 parts by weight Hydrotalcite compound particles (A-I)

3 parts by weight

0.5 parts by weight Poly (2,2,4-trimethyl-1,2-dihydroquinoline) 1 part by weight Silane coupling agent (A-172, manufactured by Nippon Tunica)

1 part by weight stearic acid

1 part by weight Example 10

The following composition was prepared, kneaded at about 30 ° C. in a staggered manner, and the kneaded product was cured at 90 ° C. for 15 minutes to obtain a 1Z8-inch thick plate. A 1Z8-inch thick test piece for UL 94-VE test was prepared from the obtained plate. The test piece was tested for UL 94 VE. As a result of the test, the flame retardancy was V-0. Composition

100 parts by weight epoxy resin (specific gravity 1.17)

100 parts by weight hydrotalcite compound particles (A-I)

5 parts by weight red phosphorus (Rinigaku Nova Excel 140)

1 part by weight Riki Bon Black (oil furnace method FEF)

10 parts by weight curing agent (HY951 made by Ciba Geigy)

1 part by weight stearic acid

0.2 parts by weight ilganox 1010

The invention's effect

ADVANTAGE OF THE INVENTION According to this invention, when it mix | blends with a synthetic resin in large quantities, the resin composition and the molded article which are hard to be thermally deteriorated, disperse | distribute, and hardly cause whitening are obtained.

Therefore, it is possible to provide a resin composition and a molded product that do not contain a halogen-based flame retardant, and it is also excellent in processability and has an advantage that no harmful gas is generated even when the molded product is burned.

Claims

The scope of the claims

1. (a) For synthetic resin,

(b) (i) The average secondary particle diameter measured by the laser diffraction scattering method is 2 m or less.

The heat-induced deterioration characterized in that the hydrated talcite compound particles represented by the following formula (1) are blended in an amount of more than 10% by weight and not more than 80% by weight based on the total weight of (a) and (b). Flame-retardant synthetic resin composition having properties.

丄 — _x Al _x (0H) ₂ A ⁿ — _{x / n} 'mH ₂ 0 (1)

However Shikichu, M represents Mg and or Zn, Alpha ^[pi - represents an n-valent Anion, x, and m represents a positive number, each satisfying the following conditions.

0 <X <0.5, 0≤ m <1

2. The synthetic resin composition according to claim 1, wherein the hydrated talcite compound particles have an average secondary particle diameter of 0.4 to 1.0 / Xm as measured by a laser diffraction scattering method.

3. The synthetic resin composition according to claim 1, wherein the total content of the iron compound and the manganese compound in the talcite compound particles is 0.01% by weight or less in terms of metal.

4. Hydrate talcite-like compound particles have a total content of iron compound, manganese compound, cobalt compound, chromium compound, copper compound, vanadium compound and nickel compound of 0.02 weight in terms of metal. %.

5. The synthetic resin composition according to claim 1, wherein the talcite compound compound particles have a specific surface area of 1 to 30 1 / g by a BET method.

6. The synthetic resin composition according to claim 1, wherein the hydrotalcite particles are decrystallized water at 150 to 300 ° C.

7. The synthetic resin composition according to claim 1, wherein the hydrotalcite-based compound particles are blended in an amount of 15 to 75% by weight based on the total weight of the synthetic resin and the octidotalcite-based compound particles.

8. The synthetic resin composition according to claim 1, wherein the synthetic resin is polyolefin or a copolymer thereof or a halogen-containing resin.

9. The hydrated talcite compound particles are at least one selected from the group consisting of higher fatty acids, anionic surfactants, phosphate esters, coupling agents, and esters of polyhydric alcohols and fatty acids. 2. The resin composition according to claim 1, which has been surface-treated with a kind of surface treatment agent.

10. The resin composition according to claim 1, further comprising 0.5 to 20% by weight of a flame retardant aid based on the total weight of the synthetic resin and the hydroidalcite compound particles.

11. The resin composition according to claim 10, wherein the flame retardant aid is red phosphorus powder or carbon powder.

1 2. (i) The average secondary particle diameter measured by the laser single diffraction scattering method is 2 m or less,

A heat-resistant, flame-retardant flame retardant characterized by comprising particles of a compound having a hydrated talcite compound represented by the following general formula (1).

M _{1 -x} Al _x (0H) ₂ A " _{-x / n} 'mH ₂ 0 (1)

0 <<0.5, 0 ≤ m <1

13. The heat-deteriorating flame retardant according to claim 12, wherein the hydrotalcite-based compound particles have an average secondary particle diameter of 0.4 to 0.5 m as measured by a laser diffraction scattering method.

13. The flame-retardant agent according to claim 12, wherein the talcite compound particles have a total content of iron compound and manganese compound of not more than 0.01% by weight in terms of metal in terms of metal. .

1 5. Hyd-mouth talcite compound particles have a total content of iron compound, manganese compound, cobalt compound, chromium compound, copper compound, vanadium compound and nickel compound of 0.02% by weight in terms of metal. 13. The heat-degradable flame retardant according to claim 12, which is:

13. The heat-resistant, flame-retardant flame retardant according to claim 12, wherein the hydrated talcite compound particles have a specific surface area of 1 to 30 m ² / g as measured by the BET method.

1 7. A molded article comprising the synthetic resin composition according to claim 1.